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10. At what depth below the earth surface the value of g radius to one-half of its value on the earth's surfaceA: R/4B: R/2C: R4: 2R​

Answer»

ANSWER B (R/2)

The FORMULA is g= GM/r^2

g/2=GM/r^2 ,g =GM/r^2/2 meaning distance from centre of MASS is r/√2 which is 4525.48339959390 m from centre of mass of EARTH .

g/4=GM/r^2 , g=GM/r^2/4 meaning distance from centre of mass is r/2 which is 3200m from the centre of mass of the earth.



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